I am pretty sure the Turbo 350 ratio is 2.52 in first gear and 1.52 in second gear, if I am off then the number is 2.48 in first gear and 1.48 in second gear but I am pretty sure it's the first set of numbers, now on the powerglide the 6cyl trans is 1.82 in low or first , the v8 transmission is 1.76 in low or first.